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lansesorry
GeoGebra
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撒针估算面积实验
龙形曲线-分形龙2
正方形雪花图案
活动三：应用性质
斐波那契螺旋弧线（表格法）
Discover Resources
三角形的构成
Add and subtract 2
認識公里
電工機械及基本電學圖解
Exploration of the conditions for congruent triangles.
Discover Topics
Centroid or Barycenter
Numbers
Conic Sections
Algebra
Statistical Characteristics